That's a really ****ing hard choice, man. I like the HAF (Europeans think it's ugly though) but it has NO AIR FILTERS so the damn thing gets dusty as ****. Cosmos S is cool but it doesn't have a window (I love windows) and the inside isn't painted black (I love black interiors). The Antec is ugly, definitely.
I'm looking at CoolerMaster's new ATCS 840 (
ATCS 840 - Cooler Master) but it doesn't have a window or a painted interior. Knowing CM they'll release a window addon later (seperate panel to buy), but I'm not sure. And if I really want it I'm going to pay a local powdercoating place to paint it black or red inside for $125.
Other than that you have a few other options (if you like black and red, like I do). Zalman's Z-machine 1000 (there's a shitty Fatal1ty version of it on Newegg, and old version of it with the number 900, and the newer 1000 version), ThermalTake's V9 and Spedo cases, and some other various ****. I've looked at all these cases. While they come close, all of them fail in one way or another and thusly I don't feel like buying them.
My current case is a CM590 with the optional window sidepanel and I custom spraypainted the interior black. I DON'T like how my spraypainting turned out, the paint chips far too easily. That's why I'm going to pay for powdercoating for my next case.